EssentialPIM - EssentialPIM is a free Personal Information Manager that keeps up with the times and lets you manage appointments, tasks, notes, contacts, password entries and email messages across multiple devices and cloud applications.

HootSuite - Enhance your social media management with Hootsuite, the leading social media dashboard. Manage multiple networks and profiles and measure your campaign results.

Todo.txt - Track your tasks and projects in a plain text file, todo.txt. A todo.

EveryoneSocial - Social selling and employee advocacy software designed to help employees become powerful marketers, sellers, and recruiters.

Task Coach - Task Coach is a simple open source todo manager to keep track of personal tasks and todo lists.

Bambu by Sprout Social - Bambu is an employee advocacy platform that gives your employees a simple way to share curated, pre-approved content across their social networks.